In 1997, McCormack appeared in an episode of Babylon 5 portraying Earthforce General Robert Lefcourt, a loyalist to the main antagonist and friend of lead protagonist Captain John Sheridan, played by Bruce Boxleitner. In this appearance he worked alongside with Star Trek alumni Carolyn Seymour. He would later reprise the role of General Lefcourt, then a Brigadier-General, in the Babylon 5 movie "In the Beginning", which took place before the actual series began.